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A1357 Datasheet(PDF) 9 Page - Allegro MicroSystems

Part # A1357
Description  Two-Wire High Precision Linear Hall-Effect Sensor IC
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Manufacturer  ALLEGRO [Allegro MicroSystems]
Direct Link  http://www.allegromicro.com
Logo ALLEGRO - Allegro MicroSystems

A1357 Datasheet(HTML) 9 Page - Allegro MicroSystems

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Two-Wire High Precision Linear Hall-Effect Sensor IC
With Pulse Width Modulated Output Current
A1357
9
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
For purposes of specification, the Sensitivity Drift Due to Pack-
age Hysteresis, ∆SensPKG, is defined as:
Sens(25°C)2 – Sens(25°C)1
Sens(25°C)1
∆SensPKG =
×100% ,
(9)
where Sens(25°C)1 is the programmed value of sensitivity at TA =
25°C, and Sens(25°C)2 is the value of sensitivity at TA = 25°C,
after temperature cycling TA up to 150°C, down to –40°C, and
back to up 25°C.
Linearity Sensitivity Error
The A1357 is designed to provide
a linear current output in response to a ramping applied magnetic
field. Consider two magnetic fields, B1 and B2. Ideally, the sen-
sitivity of a device is the same for both fields, for a given supply
voltage and temperature. Linearity error is present when there is a
difference between the sensitivities measured at B1 and B2.
Linearity Sensitivity Error is calculated separately for the positive
(LinERRPOS) and negative (LinERRNEG ) applied magnetic fields.
Linearity error (%) is measured and defined as:
SensBPOS2
SensBPOS1
SensBNEG2
SensBNEG1
1–
LinERRPOS =
×100% ,


1–
LinERRNEG =
×100% ,


(10)
where:
|D(Bx) D(Q)|
Bx
SensBx =
.
(11)
and BPOSx and BNEGx are positive and negative magnetic fields,
with respect to the quiescent current duty cycle such that BPOS2 =
2 × BPOS1 and BNEG2 = 2 × BNEG1.
Then:
LinERR max(LinERRPOS, LinERRNEG)
=
.
(12)
Note that unipolar devices only have positive linearity error
(LinERRPOS).
Symmetry Sensitivity Error
The magnetic sensitivity of the
A1357 device is constant for any two applied magnetic fields of
equal magnitude and opposite polarities. Symmetry Sensitivity
Error, SymERR (%), is measured and defined as:
SensBPOS
SensBNEG
1–
SymERR =
×100% ,


(13)
where SensBx is as defined in equation 11, and BPOS and BNEG
are positive and negative magnetic fields such that |BPOS| =
|BNEG|. Note that the Symmetry Sensitivity Error specification is
valid only for bipolar devices.
Duty Cycle Jitter
The duty cycle of the PWMOUT output may
vary slightly over time despite the presence of a constant applied
magnetic field and a constant Carrier Frequency, fPWM, for the
PWMOUT signal. This phenomenon is known as jitter, and is
defined as:
JitterPWM =
,
3
DBi ±
1
n
n
i=1
(14)
where DB1,…,DBn are the sampled duty cycles in a constant
applied magnetic field, B, measured over 1000 PWM clock peri-
ods, and JitterPWM is given in % D.


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